Yes ,I read that here as well ,it is a QO and it says
"Caution Red Leg B phase 240V " however since I found this written on a paper lying inside the panel ,I am concerned that there may be slots that are not marked with that red tape or possibly don't have that blocker type tab installed.
I guess I really need to know the best way to determine which of the slots I can use for 120V
Is it true that the breakers numbered 1 , 3 , 5 ,7 ,9 etc are 120V
And the even numbered breakers are 240V ?
Obviously I will not use any that have that little tab thing with the red tape on it,because you can't put a breaker in those slots without removing those ,so I will not even attempt that.
Now there are 4 breakers in the panel that have nothing connected to them at all, (all 20amp single pole breakers) I am concerned that if I use them , could they possibly be installed on that 240V since I did not install this panel.
What I mean to say is how can I test these to be sure they are providing the proper 120V , at this point the breakers are in the off position and so far I an reluctant to connect them to anything.